| 摘要 |
PROBLEM TO BE SOLVED: To facilitate detecting a weak signal in processing for generating a signal for azimuth-level display by processing a received wave signal generated by receiving sound waves by a plurality of sound receivers constituting a sound receiver array.SOLUTION: A phasing output (R) about a plurality of different azimuths is subjected to time integration (30) to generate a time integration output (X), sharpening (40) is performed so as to make a change in the time integration output to the azimuths steeper, and results (Y) of sharpening are accumulated (50) in a frequency direction. The sharpening is performed by Laplacian processing or unsharp mask processing. |
